120 Hours, an open architectural competition organised by students from the Oslo School of Architecture, is inviting fellow students from around the world to explore the role of the architect in today's society. The competition, according to its organisers, is in "a unique position to make students reflect on their future profession. We want to challenge people to rethink the future of architecture." Last year's competition, chaired by Julien de Smedt, received 741 submissions from 90 different countries.

With our annual Building of the Year Awards, over 30,000 readers narrowed down over 3,000 projects, selecting just 14 as the best examples of architecture that ArchDaily has published in the past year. The results have been celebrated and widely shared, of course, usually in the form of images of each project. But what is often forgotten in this flurry of image sharing is that every one of these 14 projects has a backstory of significance which adds to our understanding of their architectural quality.

Some of these projects are intelligent responses to pressing social issues, others are twists on a well-established typology. Others still are simply supreme examples of architectural dexterity. In order that we don't forget the tremendous amount of effort that goes into creating each of these architectural masterpieces, continue reading after the break for the 14 stories that defined this year's Building of the Year Awards.

After two weeks of nominations and voting, we are pleased to present the winners of the 2015 ArchDaily Building of the Year Awards. As a peer-based, crowdsourced architecture award, the results shown here represent the collective intelligence of 31,000 architects, filtering the best architecture from over 3,000 projects featured on ArchDaily during the past year.

The winning buildings represent a diverse group of architects, from Pritzker Prize winners such as Álvaro Siza, Herzog & de Meuron and Shigeru Ban, to up-and-coming practices such as EFFEKT and Building which have so far been less widely covered by the media. In many cases their designs may be the most visually striking, but each also approaches its context and program in a unique way to solve social, environmental or economic challenges in communities around the world. By publishing them on ArchDaily, these buildings have helped us to impart inspiration and knowledge to architects around the world, furthering our mission. So to everyone who participated by either nominating or voting for a shortlisted project, thank you for being a part of this amazing process, where the voices of architects from all over the world unite to form one strong, intelligent, forward-thinking message.

Back in June, we sharedJDS‘ winning mixed use project for Hangzhou, China. Conceptualized as the iconic link that fuses two prominent parts of the city, the Hangzhou H project is a dynamic experiment of formal expression. The tiered volume opens pedestrian connections at the ground level, and supports a generous landscape that functions as a rain water retainer on the roof level. The young firm has just received the necessary building permits, and will begin construction in March of 2012. We’ll keep you covered on the building’s progress, and be sure to view our previous coverage of the winning competition proposal here.

JDS has just been awarded first prize for their Hangzhou Waves scheme – a competition entry that called for the design of not one, but two buildings for the financial district of Hangzhou Xintiandi of Hangzhou, China. The two sloping volumes offer different exterior expressions and hold different programmatic entities (a hotel and an office building); yet, the forms are guided by similar attitudes regarding sunlight, green roofs, an active ground plane, etc, which immediately creates a strong relationship between the pair.

We’ve been coveringCEBRA + JDS + SeARCH + Louis Paillard’s geometric harbor project for Arhus, Denmark. The huge project, which measures over 21,000 sqm, will include mixed dwellings types and commercial space. CEBRA has shared a few short video clips with us, highlighting the progress of the project. This featured clip is shot from the bridge connecting the future harbor promenade across the nearby canal. The grey concrete wall shown is the beginning of the southern facade (the actual floor is on top of the wall) and behind the wall is where the parking is situated.